Science Experiments for 10-Year-Olds

At ten, many children want to do things themselves and can follow a multi-step plan. They can also start to ask, “How do we know that is true?” This is a good age to hand over more of the thinking and keep your own role to asking questions and keeping things safe.

These ideas work for anyone teaching a child this age. Most use household items. Anything involving heat, sharp tools or mains electricity stays with an adult, and nothing is to be tasted.

Let them design it

Instead of giving a method, give a question and three prompts:

What will you change?
What will you keep the same?
What will you measure, and how?

Let them write a plan before they start. If the plan has a flaw, let them find it when the results look odd, then ask what they would change. That lesson sticks better than being told.

1. Light a bulb with a battery

Using a small torch bulb, a single AA or D battery and a few pieces of wire, ask your child to find at least two ways to light the bulb, then at least two ways that fail. Draw each arrangement. Batteries of this size are safe to handle, but never connect wires to a mains outlet or to anything plugged in. The lesson Can you light a bulb with one wire? walks through the idea, and what lets electricity through tests which materials conduct.

2. Why does ice float?

Fill a clear glass with water and add ice. Mark the water level on the glass with a pen, then let the ice melt. Does the level change? Predict first. Then compare with a glass of cooking oil with a frozen oil cube, if you can make one. The lesson Why does ice float? covers the explanation.

3. Which fabric is best for keeping a drink warm?

Wrap identical cups of warm tap water (not boiling, an adult should pour) in different materials: wool, foil, paper, nothing. Measure the temperature every five minutes with a thermometer for half an hour and graph the lines. One line per material on a single graph makes the comparison clear. The unit on keeping things cool uses the same approach in reverse.

4. Does music affect plant growth?

This is a good example of a question that is hard to test fairly. Give your child the challenge: how many plants do you need, how will you measure growth, how do you keep light and water the same? Do not expect a dramatic result. The aim is to design the test carefully, and to consider whether the sound, the placement or chance explains any difference.

5. The strongest paper bridge

Give each child, or team, ten sheets of paper, tape and two stacks of books 20 cm (8 in) apart. Challenge them to build a bridge that holds the most coins. They can fold, roll and layer. Record the design, the load held and what failed. Then ask them to improve it once, changing only one thing.

6. Reaction time and practice

Test reaction time with a dropped ruler. Then see whether ten practice attempts improve the score. Plot the first attempt, tenth attempt and the average on a bar chart. Ask whether the improvement is bigger than the difference between people.

Stepping back

Ask a question before offering a fix: “What do you think went wrong?”
Let them keep an untidy notebook. Ideas matter more than neatness.
Praise careful measurement and honest reporting, not just the result they hoped for.
If the result disagrees with their prediction, say, “That is a real finding.”

Explaining results

Encourage a sentence in three parts: “I think…, because I saw…, which means…” Our post on claim, evidence, reasoning gives a simple pattern for it, and the scientific method for elementary children post suggests a gentle way to talk about steps without making science feel like a fixed recipe.

Where to go next

Try the unit on simple circuits as a short sequence, and browse the curriculum alignment page if you want to see where these topics sit in your region’s standards.